Straightway valve.



UNITED STATES PATENT OFFICE.

EDWARD ERDMAN, OF POTTSVILLE, PENNSYLVANIA, ASSIGNOR OF ONE- IIALF TO WILLIAM J. MATZ, O F POTTSVILLE, PENNSYLVANIA.

STRAIG HTWAY VALVE.

SPECIFICATION forming part of Letters Patent No. 709,146, dated September 16, 1902. Application filed November Z1, 1901. Serial No. 831130. (No model.)

To @ZZ whom t may concern:

Be it known that I, EDWARD M. ERDMAN, a citizen of the United States, residing at Potts- Vilie, `county of Schuylkill, and State of Pennsylvania, have invented a certain new and useful Improvement in Straightway Valves, of which the followingis a specification'.

My invention relates to a new and useful improvement in straightway valves, and has to for its object to provide a valve which when open will present practically noV resistance against the passage of steam, water, or other liquid by having the opening through the plug of the valve nearly as large if not as large as the pipe which conducts the iiuid and at the same time when the valve is closed to have it bind against the seat, so as to prevent any leakage around the plug.

With these ends in View thisinvention conzo sists in the details of construction and coin-` bination of elements hereinafter set forth and then specifically designated by the claim.

In order that those skilled in the art to which this invention appert-ains may understand z5 how to make and use the same, the construction and operation will now be described in detail, referring to the accompanying drawings, forming a part of this specification, in Which- .i y

Figure l is a central section through my improved Valve; Fig. 2, a horizontal section through the same; Fig. 3, a vertical section through the plug.

In the drawings, A represents the casing of the valve, which is open at the upper end and is bored with a straight cylindrical opening B for the plug. The inlet and outlet openings C connect with the central bore B.

D isthe plug, which has formed through it 4o the passageE. This plugD is out away upon each side, and this cut-away portion extends from the top to the vbottom of the plug, and

in these cut-'away portions are itted the blocks F, the outer surface of which conforms to the cylindrical bore B and is concentric with the balance of the plug D. ter'of the cut-away portion in which the blocks fit :is a'further cutaway portion G, which tapers inward from the top to the bot- 5o tom of the plug, as shown in Fig. 3. The

In the ceny blocks F have formed with them the rib F',

the inne r face of which is beveled to correspond with the bevel of the cut-away portion G. Thus it will be seen that if the plug D is forced downward between the blocks F these blocks will thereby be forced outward in contact with the wall of the valve'casing. This is the essential feature of myinvention. After the plug D has been inserted in the bore B of the casing the opening through the 6o upper portion of the casing is closed by the plate A, and this plate Al has formed with it the boss A2, through which the valve-stem H extends. The plug D is less in height than the distance between the bottoni ofY the casing A and the plate A; but the blocks F eX- tend from the bottom of the casing upward and in contact With the top plate A'. Therefore the plug I) may move alimited distance vertically, and the lower end of said plug 7o has a short stud I formed with it, which has its bearing Within a recess J, formed in the lower portion of the casing A. The valvestem II where it passes through the boss A2 has a screw-thread K formed thereon, which is threaded within the boss, and this stem after passing upward through the stuffingbox L is furnished with a hand-wheel M, by which the same may he turned. Thus it will be seen that as the valve-stem H is ro- 8o rated for the purpose of closing the valve the screw-thread K will also cause the plug D to be forced outward, which will force the blocks F outward against the wall of the casing, and so make a perfectly tight joint when the valve is turned off; but when it is desired to open the valve the first movement in one direction will release the blocks F and allow the plug to turn easily within the bore B. The plug may be limited in its movement by 9o coming in contact when itis closed with the bottom plate of the casing and when it is 4open with the top plate, and therefore does not need any stops lother than this for limiting the movement. This valve can also be used to great ad-` vantage as a throttle-valve, and if it was found inconvenient to give the lever which was connected to the valve-stem one-quarter movement the valve-stein could be operated roo than the chamber, said valve having a transverse passage and being cut away on two opposite sides, the cut-away portions having end shoulders parallel with the longitudinal axis of the valve and a central groove whose inner face tapers inwardly from top to bottom, a block iitting each cut-away portion of the plug and having parallel ends on which said shouldered ends of the valve slide, and

a central rib fitting said groove and having a corresponding taper, a central stem integral with the valve and having a screw-thread mating with a similar thread in the casing, and a central stud on the lower end of the valve rotatably received in a recess in said casing to guide the valve, said blocks fitting the inside of the chamber and extending from top to bottom thereof and held against up and down movement, and said valve having a limited endwise play in said blocks and abutting against the top or bottom of the easing at each end of its rotary movement in openingvand closing.

In testimony whereof I have hereunto affixed my signature in the presence of two subscribing witnesses.

EDWARD M. ERDMAN. 

